'DATA WRITE': ['DATA WRITE', 'DW'],
}
-# States
-FIND_START = 0
-FIND_ADDRESS = 1
-FIND_DATA = 2
-FIND_ACK = 3
-
class Decoder(srd.Decoder):
api_version = 1
id = 'i2c'
self.databyte = 0
self.wr = -1
self.is_repeat_start = 0
- self.state = FIND_START
+ self.state = 'FIND START'
self.oldscl = None
self.oldsda = None
self.put(self.out_ann, [ANN_SHIFTED, [protocol[cmd][0]]])
self.put(self.out_ann, [ANN_SHIFTED_SHORT, [protocol[cmd][1]]])
- self.state = FIND_ADDRESS
+ self.state = 'FIND ADDRESS'
self.bitcount = self.databyte = 0
self.is_repeat_start = 1
self.wr = -1
# read/write and ACK/NACK bits.
self.put(self.out_ann, [ANN_RAW, ['0x%.2x' % self.databyte]])
- if self.state == FIND_ADDRESS:
+ if self.state == 'FIND ADDRESS':
# The READ/WRITE bit is only in address bytes, not data bytes.
self.wr = 0 if (self.databyte & 1) else 1
d = self.databyte >> 1
- elif self.state == FIND_DATA:
+ elif self.state == 'FIND DATA':
d = self.databyte
- if self.state == FIND_ADDRESS and self.wr == 1:
+ if self.state == 'FIND ADDRESS' and self.wr == 1:
cmd = 'ADDRESS WRITE'
- elif self.state == FIND_ADDRESS and self.wr == 0:
+ elif self.state == 'FIND ADDRESS' and self.wr == 0:
cmd = 'ADDRESS READ'
- elif self.state == FIND_DATA and self.wr == 1:
+ elif self.state == 'FIND DATA' and self.wr == 1:
cmd = 'DATA WRITE'
- elif self.state == FIND_DATA and self.wr == 0:
+ elif self.state == 'FIND DATA' and self.wr == 0:
cmd = 'DATA READ'
self.put(self.out_proto, [cmd, d])
# Done with this packet.
self.startsample = -1
self.bitcount = self.databyte = 0
- self.state = FIND_ACK
+ self.state = 'FIND ACK'
def get_ack(self, scl, sda):
self.startsample = self.samplenum
self.put(self.out_ann, [ANN_SHIFTED_SHORT, [protocol[ack_bit][1]]])
# There could be multiple data bytes in a row, so either find
# another data byte or a STOP condition next.
- self.state = FIND_DATA
+ self.state = 'FIND DATA'
def found_stop(self, scl, sda):
self.startsample = self.samplenum
self.put(self.out_ann, [ANN_SHIFTED, [protocol['STOP'][0]]])
self.put(self.out_ann, [ANN_SHIFTED_SHORT, [protocol['STOP'][1]]])
- self.state = FIND_START
+ self.state = 'FIND START'
self.is_repeat_start = 0
self.wr = -1
# TODO: Wait until the bus is idle (SDA = SCL = 1) first?
# State machine.
- if self.state == FIND_START:
+ if self.state == 'FIND START':
if self.is_start_condition(scl, sda):
self.found_start(scl, sda)
- elif self.state == FIND_ADDRESS:
+ elif self.state == 'FIND ADDRESS':
if self.is_data_bit(scl, sda):
self.found_address_or_data(scl, sda)
- elif self.state == FIND_DATA:
+ elif self.state == 'FIND DATA':
if self.is_data_bit(scl, sda):
self.found_address_or_data(scl, sda)
elif self.is_start_condition(scl, sda):
self.found_start(scl, sda)
elif self.is_stop_condition(scl, sda):
self.found_stop(scl, sda)
- elif self.state == FIND_ACK:
+ elif self.state == 'FIND ACK':
if self.is_data_bit(scl, sda):
self.get_ack(scl, sda)
else: